Gets or sets the index of the currently selected drop-down item. Setting -1 deselects the current selected drop-down item. If the RibbonListViewItemDropDown.ShowCheckMargin property is set to true, the corresponding item of the drop-down menu is checked when it is opened . If the RibbonListViewItemDropDown.ShowText property is set to true, setting this property updates the RibbonListViewItemDropDown.Text property with the text of the corresponding RibbonListViewItemDropDown.SelectedItem property value. The default value is -1.
